Mercurial > hg > truffle
diff src/share/vm/oops/klassVtable.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | f8236e79048a |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/oops/klassVtable.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,316 @@ +/* + * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +// A klassVtable abstracts the variable-length vtable that is embedded in instanceKlass +// and arrayKlass. klassVtable objects are used just as convenient transient accessors to the vtable, +// not to actually hold the vtable data. +// Note: the klassVtable should not be accessed before the class has been verified +// (until that point, the vtable is uninitialized). + +// Currently a klassVtable contains a direct reference to the vtable data, and is therefore +// not preserved across GCs. + +class vtableEntry; + +class klassVtable : public ResourceObj { + KlassHandle _klass; // my klass + int _tableOffset; // offset of start of vtable data within klass + int _length; // length of vtable (number of entries) +#ifndef PRODUCT + int _verify_count; // to make verify faster +#endif + + // Ordering important, so greater_than (>) can be used as an merge operator. + enum AccessType { + acc_private = 0, + acc_package_private = 1, + acc_publicprotected = 2 + }; + + public: + klassVtable(KlassHandle h_klass, void* base, int length) : _klass(h_klass) { + _tableOffset = (address)base - (address)h_klass(); _length = length; + } + + // accessors + vtableEntry* table() const { return (vtableEntry*)(address(_klass()) + _tableOffset); } + KlassHandle klass() const { return _klass; } + int length() const { return _length; } + inline methodOop method_at(int i) const; + inline methodOop unchecked_method_at(int i) const; + inline oop* adr_method_at(int i) const; + + // searching; all methods return -1 if not found + int index_of(methodOop m) const { return index_of(m, _length); } + int index_of_miranda(symbolOop name, symbolOop signature); + + void initialize_vtable(bool checkconstraints, TRAPS); // initialize vtable of a new klass + + // conputes vtable length (in words) and the number of miranda methods + static void compute_vtable_size_and_num_mirandas(int &vtable_length, int &num_miranda_methods, + klassOop super, objArrayOop methods, + AccessFlags class_flags, oop classloader, + symbolOop classname, objArrayOop local_interfaces); + + // RedefineClasses() API support: + // If any entry of this vtable points to any of old_methods, + // replace it with the corresponding new_method. + // trace_name_printed is set to true if the current call has + // printed the klass name so that other routines in the adjust_* + // group don't print the klass name. + void adjust_method_entries(methodOop* old_methods, methodOop* new_methods, + int methods_length, bool * trace_name_printed); + + // Garbage collection + void oop_follow_contents(); + void oop_adjust_pointers(); + +#ifndef SERIALGC + // Parallel Old + void oop_follow_contents(ParCompactionManager* cm); + void oop_update_pointers(ParCompactionManager* cm); + void oop_update_pointers(ParCompactionManager* cm, + HeapWord* beg_addr, HeapWord* end_addr); +#endif // SERIALGC + + // Iterators + void oop_oop_iterate(OopClosure* blk); + void oop_oop_iterate_m(OopClosure* blk, MemRegion mr); + + // Debugging code + void print() PRODUCT_RETURN; + void verify(outputStream* st, bool force = false); + static void print_statistics() PRODUCT_RETURN; + +#ifndef PRODUCT + bool check_no_old_entries(); + void dump_vtable(); +#endif + + protected: + friend class vtableEntry; + private: + void copy_vtable_to(vtableEntry* start); + int initialize_from_super(KlassHandle super); + int index_of(methodOop m, int len) const; // same as index_of, but search only up to len + void put_method_at(methodOop m, int index); + static bool needs_new_vtable_entry(methodOop m, klassOop super, oop classloader, symbolOop classname, AccessFlags access_flags); + AccessType vtable_accessibility_at(int i); + + bool update_super_vtable(instanceKlass* klass, methodHandle target_method, int super_vtable_len, bool checkconstraints, TRAPS); + + // support for miranda methods + bool is_miranda_entry_at(int i); + void fill_in_mirandas(int& initialized); + static bool is_miranda(methodOop m, objArrayOop class_methods, klassOop super); + static void add_new_mirandas_to_list(GrowableArray<methodOop>* list_of_current_mirandas, objArrayOop current_interface_methods, objArrayOop class_methods, klassOop super); + static void get_mirandas(GrowableArray<methodOop>* mirandas, klassOop super, objArrayOop class_methods, objArrayOop local_interfaces); + static int get_num_mirandas(klassOop super, objArrayOop class_methods, objArrayOop local_interfaces); + + + void verify_against(outputStream* st, klassVtable* vt, int index); + inline instanceKlass* ik() const; +}; + + +// private helper class for klassVtable +// description of entry points: +// destination is interpreted: +// from_compiled_code_entry_point -> c2iadapter +// from_interpreter_entry_point -> interpreter entry point +// destination is compiled: +// from_compiled_code_entry_point -> nmethod entry point +// from_interpreter_entry_point -> i2cadapter +class vtableEntry VALUE_OBJ_CLASS_SPEC { + public: + // size in words + static int size() { + return sizeof(vtableEntry) / sizeof(HeapWord); + } + static int method_offset_in_bytes() { return offset_of(vtableEntry, _method); } + methodOop method() const { return _method; } + + private: + methodOop _method; + void set(methodOop method) { assert(method != NULL, "use clear"); _method = method; } + void clear() { _method = NULL; } + void print() PRODUCT_RETURN; + void verify(klassVtable* vt, outputStream* st); + + friend class klassVtable; +}; + + +inline methodOop klassVtable::method_at(int i) const { + assert(i >= 0 && i < _length, "index out of bounds"); + assert(table()[i].method() != NULL, "should not be null"); + assert(oop(table()[i].method())->is_method(), "should be method"); + return table()[i].method(); +} + +inline methodOop klassVtable::unchecked_method_at(int i) const { + assert(i >= 0 && i < _length, "index out of bounds"); + return table()[i].method(); +} + +inline oop* klassVtable::adr_method_at(int i) const { + // Allow one past the last entry to be referenced; useful for loop bounds. + assert(i >= 0 && i <= _length, "index out of bounds"); + return (oop*)(address(table() + i) + vtableEntry::method_offset_in_bytes()); +} + +// -------------------------------------------------------------------------------- +class klassItable; +class itableMethodEntry; + +class itableOffsetEntry VALUE_OBJ_CLASS_SPEC { + private: + klassOop _interface; + int _offset; + public: + klassOop interface_klass() const { return _interface; } + int offset() const { return _offset; } + + static itableMethodEntry* method_entry(klassOop k, int offset) { return (itableMethodEntry*)(((address)k) + offset); } + itableMethodEntry* first_method_entry(klassOop k) { return method_entry(k, _offset); } + + void initialize(klassOop interf, int offset) { _interface = interf; _offset = offset; } + + // Static size and offset accessors + static int size() { return sizeof(itableOffsetEntry) / HeapWordSize; } // size in words + static int interface_offset_in_bytes() { return offset_of(itableOffsetEntry, _interface); } + static int offset_offset_in_bytes() { return offset_of(itableOffsetEntry, _offset); } + + friend class klassItable; +}; + + +class itableMethodEntry VALUE_OBJ_CLASS_SPEC { + private: + methodOop _method; + + public: + methodOop method() const { return _method; } + + void clear() { _method = NULL; } + + void initialize(methodOop method); + + // Static size and offset accessors + static int size() { return sizeof(itableMethodEntry) / HeapWordSize; } // size in words + static int method_offset_in_bytes() { return offset_of(itableMethodEntry, _method); } + + friend class klassItable; +}; + +// +// Format of an itable +// +// ---- offset table --- +// klassOop of interface 1 \ +// offset to vtable from start of oop / offset table entry +// ... +// klassOop of interface n \ +// offset to vtable from start of oop / offset table entry +// --- vtable for interface 1 --- +// methodOop \ +// compiler entry point / method table entry +// ... +// methodOop \ +// compiler entry point / method table entry +// -- vtable for interface 2 --- +// ... +// +class klassItable : public ResourceObj { + private: + instanceKlassHandle _klass; // my klass + int _table_offset; // offset of start of itable data within klass (in words) + int _size_offset_table; // size of offset table (in itableOffset entries) + int _size_method_table; // size of methodtable (in itableMethodEntry entries) + + void initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS); + public: + klassItable(instanceKlassHandle klass); + + itableOffsetEntry* offset_entry(int i) { assert(0 <= i && i <= _size_offset_table, "index out of bounds"); + return &((itableOffsetEntry*)vtable_start())[i]; } + + itableMethodEntry* method_entry(int i) { assert(0 <= i && i <= _size_method_table, "index out of bounds"); + return &((itableMethodEntry*)method_start())[i]; } + + int nof_interfaces() { return _size_offset_table; } + + // Initialization + void initialize_itable(bool checkconstraints, TRAPS); + + // Updates + void initialize_with_method(methodOop m); + + // RedefineClasses() API support: + // if any entry of this itable points to any of old_methods, + // replace it with the corresponding new_method. + // trace_name_printed is set to true if the current call has + // printed the klass name so that other routines in the adjust_* + // group don't print the klass name. + void adjust_method_entries(methodOop* old_methods, methodOop* new_methods, + int methods_length, bool * trace_name_printed); + + // Garbage collection + void oop_follow_contents(); + void oop_adjust_pointers(); + +#ifndef SERIALGC + // Parallel Old + void oop_follow_contents(ParCompactionManager* cm); + void oop_update_pointers(ParCompactionManager* cm); + void oop_update_pointers(ParCompactionManager* cm, + HeapWord* beg_addr, HeapWord* end_addr); +#endif // SERIALGC + + // Iterators + void oop_oop_iterate(OopClosure* blk); + void oop_oop_iterate_m(OopClosure* blk, MemRegion mr); + + // Setup of itable + static int compute_itable_size(objArrayHandle transitive_interfaces); + static void setup_itable_offset_table(instanceKlassHandle klass); + + // Resolving of method to index + static int compute_itable_index(methodOop m); + + // Debugging/Statistics + static void print_statistics() PRODUCT_RETURN; + private: + intptr_t* vtable_start() const { return ((intptr_t*)_klass()) + _table_offset; } + intptr_t* method_start() const { return vtable_start() + _size_offset_table * itableOffsetEntry::size(); } + + // Helper methods + static int calc_itable_size(int num_interfaces, int num_methods) { return (num_interfaces * itableOffsetEntry::size()) + (num_methods * itableMethodEntry::size()); } + + // Statistics + NOT_PRODUCT(static int _total_classes;) // Total no. of classes with itables + NOT_PRODUCT(static long _total_size;) // Total no. of bytes used for itables + + static void update_stats(int size) PRODUCT_RETURN NOT_PRODUCT({ _total_classes++; _total_size += size; }) +};